The son-in-law of the couple killed in an explosion Feb. 10 has been arrested for their murders.

The Wilson County Sheriff’s Office responded to an explosion at 580 Vance Lane in Lebanon on that day. Jon Setzer was found deceased in the home, and Marion Setzer was airlifted to Vanderbilt Hospital. Marion Setzer passed away from her injuries, Thursday, Feb. 13.

According to the Tennessee Bureau of Investigation, Richard Parker, 49, Lebanon was arrested Friday, Feb. 14. Evidence collected was enough for the Wilson County Grandy Jury to return indictments for two counts of Felony First Degree Murder and two counts of Pre-Meditated First Degree Murder. He was also charged with Unlawful Possession of a Prohibited Weapon. Parker was taken to the Wilson County Jail on a $1,000,000 bond. He had one previous conviction of arson in Giles County in 1993. He served probation for four years for the conviction.

The Federal Bureau of Investigation, Tennessee Bureau of Investigation, the Bureau of Alcohol, Tobacco, Firearms and Explosives, Tennessee State Fire Marshal’s Bomb and Arson Unit, the State Department of Homeland Security and the Wilson County Sheriff’s Office all worked on the case.

According to the Tennessee Bureau of Investigation, the investigation is still active and ongoing. The motive and exact circumstances surrounding this incident are still being determined.